AREF Switch

The switch named AREF selects the input to the AREF-pin on the ATmega169.

Figure 1. AREF Switch

Positions:

AREF:

In this position the AREF from the STK500 is connected to the AREF pin on the ATmega169. This is the default position.

VREF:

In this position the VREF from the 1.263V voltage reference on the STK502 is connected to the AREF pin on the ATmega169. Select this position in order to run the code in Application Note "AVR064: STK502 – A Temperature Monitoring System with LCD Output"